Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2012
Allowance For Doubtful Accounts And Notes Receivable [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 2,347	$ 2,992	$ 3,366
Additions Charged to Costs and Expenses	(434)	(367)	764
Amounts Written Off Against the Allowance	(142)	(278)	(1,152)
(Transfer) Recoveries			14
Balance at End of Year	1,771	2,347	2,992
Accrued Carrying Costs For Drive-In Closings And Disposals [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	1,099	568	421
Additions Charged to Costs and Expenses	339	809	366
Amounts Written Off Against the Allowance	(546)	(249)	(219)
(Transfer) Recoveries	(21)	(29)
Balance at End of Year	$ 871	$ 1,099	$ 568